Activating screensavers in Mate or Cinnamon as command(s)

The command to activate the pre-selected screensaver(s) in Linux Mint, from a shell, or e.g. in the command field of 'Active Corners' in the 'System Settings' in order to fixate the command is....

For the Mate desktop, activate screensaver:

mate-screensaver-command -a

For the Cinnamon desktop, activate screensaver:

cinnamon-screensaver-command -a

The -d flag will deactivate the screensaver, just to be complete here. (I have read the question somewhere else.) Also, the -h flag will print help in a shell.

In order to just blank out the screen, this command will do on either system:

xset dpms force off